Gree GMV-400WM/B-X - Page 147

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
144
4.2 The
high
pressure
and low
pressure
sensors
are
connecte
d
reversely
.
Connect the
stop valve of
the module
fluid pipe and
air pipe to the
high and low
pressure
gauges and
transform the
readings into
correspondin
g
temperatures
. Compare
them to the
high- and
low-temperat
ures tested
by the
system. If the
difference is
larger than
5°C , it is
exceptional.
——
——
Reconnec
t the high-
and
low-press
ure
sensors.
5. The
high
pressure
switch is
faulty.
E1
protection
is
displayed
on the
unit when
it is
powered
on.
5.1 The
high
pressure
switch is
not
connecte
d to the
main
board.
——
5.1.1
The
pressure
switch is
not
connect
ed to the
main
board.
——
Reconnec
t it.
——
5.1.2
The
connect
wire
between
the
pressure
switch
and
main
board is
faulty.
——
Reconnec
t them
with the
wire.
5.2 The
high
pressure
switch is
damaged
.
——
——
——
Replace
the
pressure
switch.
6. The
fan is not
working
properly.
A. The
ODU's
fan does
not work
in the
cooling
mode. B.
The IDU's
motor
6.1 The
IDU's fan
is faulty.
Manual check
6.1.1
The
power
cable
connecti
ng the
motor
and
main
Manual
check
Reconnec
t the
motor with
the power
cable.